Side to side un-balance can be an issue that might affect tire life if you just assume a 50/50 split for tire loads of the axle weight. We have seen some axles with the un-balance of 500 to 1,000# and that can mean you might be significantly overloading a tire which could lead to early failure.
Learning individual axle loads is relatively easy as you can get those numbers at any truck stop scale by just paying attention to which axle is on which scale pad. You can get the two readings by asking for a re-weigh.
Learning the load on the ends of each axle is more involved and unless you can get to Escapees or RVSEF weighing location you are not likely to find a place that can give you individual tire position weights.
Here is a
worksheet. Next, you will need to call around and check at a building supply or sand & Gravel pit or similar to see if there is a scale that you can get just one side weighed. CAT scales do not want you to do the one-side weight measurement so that is why they have a guard rail so close to the scale pad.